phenylephrine vs terazosin
Side-by-side comparison of phenylephrine and terazosin. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Terazosin has been used concomitantly in at least 50 patients on the following drugs or drug classes: analgesic/anti-inflammatory (e.g., acetaminophen, aspirin, codeine, ibuprofen, indomethacin); antibiotics (e.g., erythromycin, trimethoprim and sulfamethoxazole); anticholinergic/sympathomimetics (e.g., phenylephrine hydrochloride, phenylpropanolamine hydrochloride, pseudoephedrine hydrochloride); antigout (e.g., allopurinol); antihistamines (e.g., chlorpheniramine); cardiovascular agents (e.g., atenolol, hydrochlorothiazide, methyclothiazide, propranolol); corticosteroids;...
Recommendation: Talk to your doctor before using these together, as your blood pressure may need to be checked more often. They may suggest a different decongestant that does not affect blood pressure.
Neo-Synephrine
Hytrin
Phenylephrine is a medicine that helps relieve cold and flu symptoms. It can reduce fever and relieve pain.
Terazosin is a medicine that can help men with enlarged prostate and also treat high blood pressure. It works by relaxing certain muscles in your body.
This medicine temporarily relieves symptoms from a cold. It can help with minor aches and pains, headache, and nasal and sinus congestion. It can also soothe a sore throat and cough caused by minor throat irritation. Phenylephrine can also temporarily reduce fever.
Terazosin is used to treat enlarged prostate in men. An enlarged prostate can cause problems with urination. Terazosin helps improve urine flow and reduce symptoms. It is also used to treat high blood pressure, either alone or with other medicines.
Phenylephrine works by narrowing blood vessels in your nose and sinuses. This helps to reduce congestion and makes it easier to breathe. It also helps to reduce inflammation and pain.
Terazosin belongs to a class of drugs called alpha-1 blockers. It works by relaxing the muscles in the prostate and bladder neck, making it easier to urinate. It also relaxes blood vessels, which helps to lower blood pressure.
No common side effects listed.
- • Feeling weak or tired
- • Dizziness
- • Stuffy nose
- • Headache
- Blistering skin disorder 948
- Swollen joint 920
- Pain 902
- Rheumatoid arthritis 872
- Inflammation around the heart 868
- Tiredness 466
- Diarrhea 395
- Feeling dizzy 385
- Difficulty breathing 383
- Weakness 351
Do not take more medicine than directed, as overdose can be dangerous. Do not use this medicine in children under 12 years of age.
Be careful when you first start taking terazosin, as it can cause your blood pressure to drop too low. This can lead to dizziness or fainting. Take your first dose at bedtime and be careful when standing up.
It is not known if this medicine will harm your unborn baby. Talk to your doctor before taking this medicine if you are pregnant or breastfeeding.
It is not known if terazosin can harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is also not known if terazosin passes into breast milk, so talk to your doctor if you are breastfeeding.
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How to Read This phenylephrine vs terazosin Comparison
phenylephrine is classified in the Alpha-1 Agonist drug class, while terazosin sits within the Alpha-1 Blocker class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, phenylephrine has 4,510 submissions while terazosin has 1,980. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to these drugs work against each other because one relaxes blood vessels to lower blood pressure while the other narrows them to raise it. this can make your blood pressure medicine less effective.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between phenylephrine and terazosin - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.